Draft-rigging.



no. 693,335. A I Patented ren. Il, |902.

' f W. M. PIPER.

.p3A-F1 mesma. ppucmn mednn. 16, 1901. mpnwea Aug; 17, 1901.)

No Model.)

2 sheets-snm l.`

- wrrusssss Mmmmgm y y y ,www

mi Nonms PETERS CQ. PHOTOLITHEL wnsnlNuToN. D c4 UNITED STATES PATENT OFFICE.

WILLIAM MORGAN PIPER, OF ALLEGHENY, PENNSYLVANIA.

DRAM- mesme SPECIFICATION formng'part of Letters Patent No. 693,335, dated February 1 1, 1902. Application filed January 16, 1901. Renewed August 17, 1901.y Serial No. 72,420. (No model.)

To all whom, it' may concern'.-

Be itknown that I, WILLIAM MORGAN PIPER, of Allegheny, in the county of VAllegheny and State of Pennsylvania, have invented a new and useful Draft-Rigging, of which the followingisa full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which-- Figure l is a top plan View, partly broken away, of adraft-rigging constructed in ac- `-hr`.cordance with my invention; and Figs. 2, 3,

4, and 5 are similar views showing modified forms of the same.

My invention relates to that class of draftriggings in which spring-'pressed frictionblocks are employed and is designed to increase the friction without complicating or adding to the parts and to secure differential action of wedge-blocks, and thus regulate accurately the amount of friction obtained.

In the drawings, referring to the form of Fig. l, 2 :2 are the draft-irons, 3 the draw, bar, and 4 the yoke, of the draft-rigging. 5 5 are end followers extending through the ends of the yoke and normally contacting with fixed stops 6 on the draft-iron. Each of these followers is provided with oppositely-inclined faces 7 7, with which coact similarly-inclined faces of a pair of wedge-blocks 8 8, which are .normally forced apart by an intermediate spring 9. Between the two pairs of wedgeblocks is a follower 10, having at each side oppositely-inclined faces l1 l1, which are formed at a greater angle than the faces '7 7. Similar faces on the blocks 8 coact with the inclines ll on the opposite sides of the fol-- lower, and I have shown one set of wedgeblocks as having one actuating-spring, while the other pair is provided with rtwo spiral springs.

In the operation of the device, when a pulling or bufting strain is exerted upon the drawbar one of the transverse blocks or followers 5 will press upon thepair of wedge-blocks 8 8, and these in turn will press uponv the more sharply inclined faces of the follower l0. A dierential action is thus obtained with the inclined surfaces in the same direction, and the friction will be largely increased over that where a flat face or inclines in the opposite direction from those on the middle follower are used on the followers 5. The pressure from one follower will of course be exerted through the follower lO and actuate the entire system, the wedge-blocks of veach set moving toward eachother against the resistance of the springs and the friction of the inclined surfaces. t-he springs will return the parts to their no1'- lnal position.

In the form of Fig. 2 the yfaces of the followers 5 and l0n are inclined in the opposite direction from those of Fig. l and consist in part of curved surfaces instead of' flat inclines. In this case the inclines of the followers 5 are of greater angularity than those of the middle follower.

In Fig. 3 I show. a forni similar' to that of Fig. 2, except that the inclines are all fiatfaced.

Then the strainisreleased,

In Fig. 4 I show a simpler form consisting of two followers 5c and 10C, having curved faces of different angles, the faces of the wedge-blocks 8 being similarly curved. The form of Fig. 5 is similar to that of Fig. 4, except that the faces of the followers'd lOd and of the Wedge-blocks Sd are provided with fiat inclines.

The advantages of my invention result from the use of at least a pair of transverse blocks having coacting inclines, the inclines 1 of one block being at a greater angle than those of the other, so that a differential action is obtained upon the wedge-blocks, and this principle I consider, broadly, novel.

Many changes may be made in the forni land arrangement of the parts without departing from my invention.

I claim- 1. In a draft-rigging, a pair of transverse blocks having oppositely-inclined faces, the faces of one block being inclined in the same direction as, and at a less angle than, those of the other block, and spring-pressed wedgeblocks bearing on said faces; substantially as described.

2. In a draft-rigging, a plurality of transverse movable followers havinginclined faces, and sets of spring-pressed wedge-blocks movable toward and from eachother, and having inclined faces coacting with those of the transverse blocks or followers, the inclined face of one follower being in the same direction as,

IOS)

and at a less angle than, those of the other follower, the sp1-ings being interposed between the wedge-blocks; substantially as described.

blocks bearing on said faces, at least a part 1o of said inclines having curved faces; substantially as described.

In testimony Whex'of I have hereunto set WILLIAM MORGAN PIPER. Witnesses:

GEORGE B. BLEMING,

WARREN W. SWARTZ. 

